Visual Tree Helper使列表框SelectionChanged激发两次

可视化树代码

public static IEnumerable<T> FindVisualChildren<T>(DependencyObject depObj) where T : DependencyObject
    {
        if (depObj != null)
        {
            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
            {
                DependencyObject child = VisualTreeHelper.GetChild(depObj, i);
                if (child != null && child is T)
                {
                    yield return (T)child;
                }
                foreach (T childOfChild in FindVisualChildren<T>(child))
                {
                    yield return childOfChild;
                }
            }
        }
    }

选择更改的代码

 private void mylistBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        if (mylistBox.SelectedItem == null)
            return;
             foreach (Button tb in FindVisualChildren<Button>(mainListBox))
        {
           Debug.WriteLine(tb.Name);
        }
        }

输出注意，它写了两次两个按钮的名称，所以它循环了4次，只有两个按钮。选项Btn选项Btn2选项BtnoptionBtn2